Sheldon theory 73 number.

Hypothetical manipulative theory, sheldon 73 theory.

73 - Sheldon number.

Swapping numbers 73 we get number 37
73 is the 21 prime number in the sequence.

Swapping the numbers in number 21 we get the number12

4 level number
4 + 4 level number 8
4+4+4 level number 12

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